Presumed without analysis.
Self-evident, intuitively obvious.
Based on hypothesis and theory rather than experiment or empirical evidence.
Developed entirely from scratch, without deriving it from existing languages.
In a way based on theoretical deduction rather than empirical observation.
Hypothetical, based on supposition; suppositional.
Imaginary; fictitious, pretended to exist.
Spurious; substituted for the genuine, counterfeit; fake; supposititious.